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Tire Conversion Chart.


This is a discussion on Tire Conversion Chart. within the Exterior forums, part of the 4th Gen : 2009 - Present category!
i hope this helps! 225/85R 14 = 29 X 9.00 X 14 215/75R 15 = 28 X 8.50 X 15 ...


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Old 07-16-2010, 11:20 AM   #1 (permalink)
 
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Default Tire Conversion Chart.
i hope this helps!

225/85R 14 = 29 X 9.00 X 14
215/75R 15 = 28 X 8.50 X 15
215/85R 15 = 29 X 8.50 X 15
225/75R 15 = 28 X 9 X 15
235/75R 15 = 29 X 9 X 15
325/60R 15 = 31 X 12.50 X 15
Q78-15 = 35.50 X 11.00 X 15
215/70R 16 = 28 X 8.50 X 16
225/70R 16 = 28.50 X 9 X 16
225/75R 16 = 30 X 9 X 16
235/70R 16 = 29 X 9.50 X 16
235/85R 16 = 32 X 9.50 X 16
245/70R 16 = 30 X 10 X 16
245/75R 16 = 31 X 10 X 16
255/70R 16 = 30 X 10.50 X 16
255/85R 16 = 33 X 10.50 X 16
265/70R 16 = 31 X 10.50 X 16
265/75R 16 = 32 X 10.50 X 16
265/80R 16 = 32.50 X 10.00 X 16
275/70R 16 = 31.50 X 11 X 16
285/75R 16 = 33 X 11.50 X 16
295/75R 16 = 33.50 X 12 X 16
305/70R 16 = 33 X 12.50 X 16
305/85R 16 = 36 X 11.50 X 16
315/75R 16 = 35 X 12.50 X 16
325/70R 16 = 34 X 13 X 16
325/80R 16 = 37 X 13 X 16
365/65R 16 = 35 X 14.50 X 16
Q78-16 = 35.50 X 11.00 X 16
265/70R 17 = 32 X 11.50 X 17
275/70R 17 = 32.50 X 11.00 X 17
285/70R 17 = 33 X 11.50 X 17
295/70R 17 = 33 X 12.0 X 17
305/70R 17 = 34 X 12.00 X 17
315/70R 17 = 34.50 X 12 X 17
255/55R 18 = 29 X 10.50 X 18
285/60R 18 = 32 X 11 X 18
285/65R 18 = 33 X 11.50 X 18
325/60R 18 = 33 X 13 X 18
325/65R 18 = 35 X 13 X 18
355/65R 18 = 37 X 14 X 18
305/50R 20 = 32 X 12.50 X 20
305/55R 20 = 33 X 12.50 X 20
325/60R 20 = 35 X 13.00 X 20
355/60R20 = 36.50 X 14.00 X 20
325/50R22 = 35 X 13.00 X 22


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Old 07-16-2010, 01:29 PM   #2 (permalink)
 
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Good info.

Or if you want to convert it yourself:

1. take the first number (the width in millimeters) and divide by 25.4, this give you the width in inches

2. multiply be the second number (aspect ratio) divide by 100 (percentage), this gives you the sidewall height

3. multiply by 2, the add the 3rd number (wheel diameter)

Example: 275/60 R20 (factory 20" Ram tires)

1. 275/25.4= 10.82677 inches

2. 10.82677*60/100 or 10.82677/.6 = 6.496 inches

3. 6.496*2 = 12.992 + 20 = 32.992 = 33" tire height.
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Old 07-16-2010, 01:48 PM   #3 (permalink)
 
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That chart and formula will get you in the ballpark, but depending on the manufacturer the actual tire height will vary because of tread pattern or what have you. Case in point:

265-70-17 AT tires:
Formula Height: 31.61
Nitto Terra Grappler actual height: 31.57
BFG AT: 31.8
Dick Cepek Radial F-C II: 31.7

Not that a 10th of an inch makes that much real world difference, but just pointing that out.


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Old 07-16-2010, 11:02 PM   #4 (permalink)
 
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good info fellas .. stickie time
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Old 07-30-2010, 09:29 AM   #5 (permalink)
 
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this is good to have also ...

Metric Tire Conversion Chart
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Old 03-24-2012, 07:59 AM   #6 (permalink)
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Here's a handy calculator I've been using for years, it has a nice feature of showing you size differences as well!!


Tire size calculator
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Old 03-24-2012, 09:55 AM   #7 (permalink)
 
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I used that calculated till I found this one, extremely handy!
Tire Size Calculator - tire & wheel plus sizing
It tells you what the original tire by vehicle and allows you to compare to different sizes and tells you the %differences
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Old 11-19-2013, 06:34 AM   #8 (permalink)
 
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Tire Size Conversion
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Old 04-06-2014, 02:08 PM   #9 (permalink)
 
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Originally Posted by powerhour View Post
i hope this helps!

225/85R 14 = 29 X 9.00 X 14
215/75R 15 = 28 X 8.50 X 15
215/85R 15 = 29 X 8.50 X 15
225/75R 15 = 28 X 9 X 15
235/75R 15 = 29 X 9 X 15
325/60R 15 = 31 X 12.50 X 15
Q78-15 = 35.50 X 11.00 X 15
215/70R 16 = 28 X 8.50 X 16
225/70R 16 = 28.50 X 9 X 16
225/75R 16 = 30 X 9 X 16
235/70R 16 = 29 X 9.50 X 16
235/85R 16 = 32 X 9.50 X 16
245/70R 16 = 30 X 10 X 16
245/75R 16 = 31 X 10 X 16
255/70R 16 = 30 X 10.50 X 16
255/85R 16 = 33 X 10.50 X 16
265/70R 16 = 31 X 10.50 X 16
265/75R 16 = 32 X 10.50 X 16
265/80R 16 = 32.50 X 10.00 X 16
275/70R 16 = 31.50 X 11 X 16
285/75R 16 = 33 X 11.50 X 16
295/75R 16 = 33.50 X 12 X 16
305/70R 16 = 33 X 12.50 X 16
305/85R 16 = 36 X 11.50 X 16
315/75R 16 = 35 X 12.50 X 16
325/70R 16 = 34 X 13 X 16
325/80R 16 = 37 X 13 X 16
365/65R 16 = 35 X 14.50 X 16
Q78-16 = 35.50 X 11.00 X 16
265/70R 17 = 32 X 11.50 X 17
275/70R 17 = 32.50 X 11.00 X 17
285/70R 17 = 33 X 11.50 X 17
295/70R 17 = 33 X 12.0 X 17
305/70R 17 = 34 X 12.00 X 17
315/70R 17 = 34.50 X 12 X 17
255/55R 18 = 29 X 10.50 X 18
285/60R 18 = 32 X 11 X 18
285/65R 18 = 33 X 11.50 X 18
325/60R 18 = 33 X 13 X 18
325/65R 18 = 35 X 13 X 18
355/65R 18 = 37 X 14 X 18
305/50R 20 = 32 X 12.50 X 20
305/55R 20 = 33 X 12.50 X 20
325/60R 20 = 35 X 13.00 X 20
355/60R20 = 36.50 X 14.00 X 20
325/50R22 = 35 X 13.00 X 22
Great post. That's a lot of typing!

Sent from my Note 3 using Tapatalk Pro!
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Old 07-28-2015, 08:44 PM   #10 (permalink)
 
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I keep trying to figure out for the tires im planning on buying but dosent seem right, Let me know what you guys get.

285/65/20

295/65/20


Thanks.
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